This essay analyzes modern and postmodern concepts of freedom and contrasts them to a Hiedeggerian understanding. Positive, negative, and what might be called Foucaultian or Nietzschean liberty are demonstrated to bear a common trait. In such modern and postmodern formulations, freedom is consistently identified with a form of mastery. This identification of freedom with mastery, I argue, encourages ecological abuse, supports the dangerous prerogatives of statist sovereignty, and strengthens the resilience of patriarchy. The political significance of Heidegger's alternative vision is addressed.